Ge. Arutyunov et Sa. Frolov, 4 GRAVITON SCATTERING-AMPLITUDE FROM (SR8)-R-N SUPERSYMMETRIC ORBIFOLD SIGMA-MODEL, Nuclear physics. B, 524(1-2), 1998, pp. 159-206
In the IR limit the Matrix string theory is expected to be described b
y the (SR8)-R-N supersymmetric orbifold sigma model. Recently Dijkgraa
f, Verlinde and Verlinde proposed a vertex that may describe the type
IIA string interaction. In this paper using this interaction vertex we
derive the four graviton scattering amplitude from the orbifold model
in the large N limit. (C) 1998 Published by Elsevier Science B.V.